Lower Box Creek Reservoir Algal Bloom Monitoring 2019

Warning Advisory

  • Do not swim or water ski in this area.
  • Avoid areas of algae scum when boating.
  • Keep animals away.
  • Do not ingest the water.
  • Clean fish well and discard guts.

Report a Bloom

24-Hour DEQ Environment Incidents Line: (801) 536-4123

Call Utah Poison Control Center

If you believe you or your pet have been exposed to a harmful algal bloom, call (800) 222-1222.

Visit the 2019 Photo Gallery

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Help us track cyanobacteria blooms with your smartphone. Go to cyanos.org for more info.

Update September 16, 2019

Lower Box Creek Reservoir, September 11, 2019

The Central Utah Public Health Department (CUPHD) issued a Warning Advisory for Lower Box Creek Reservoir on September 16, 2019.

Cyanobacteria cell-count concentrations for samples collected by the Division of Water Quality (DWQ) at the access point on Lower Box Creek Reservoir on September 11, 2019, exceeded the recreation health-based threshold for a Warning Advisory. The primary taxon in the samples was Aphanizomenon. Toxin test results received from the Utah Public Health Lab (UPHL) showed that anatoxin-a and microcystin levels were well below the advisory threshold.

The DWQ monitoring crew observed visible cyanobacteria that resembled bright green grass clippings. These cyanobacteria were consistent throughout the water column and were also clumped together in a few places.

A Warning Advisory indicates a moderate relative probability of acute health risk, cell-count density of 20,000 – 10 million cells per milliliter (cells/ml), microcystin levels of 4-2,000 micrograms per liter (µg/L), or anatoxin-a levels above non-detect.

Data Summary

  • Sample type: Elbow-depth integrated composite sample
  • Sample date: September 11, 2019
  • Microcystin: 2.1 micrograms per liter (µg/L)
  • Anatoxin-a: <0.10 µg/L
  • Cyanobacteria cell counts: 63,611 cells per milliliter (cells/mL)